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Startup and Instability of a Loop Thermosyphon With Multiple Evaporators

Abstract:

Loop thermosiphon can combine free cooling and cooling energy distribution with low consumption, therefore it has unique application potential in energy saving of data centers. In this paper, an experimental platform for loop thermalsyphon with three evaporators is established and flow visualization is achieved. The startup and instability are investigated to provide basic theoretical support for its application. The results show that boiling occurs firstly at the top of an evaporator when the filling ratio is relatively large. After reaching steady state, the temperature at the top is lower than that of the bottom due to the larger bubble and more intense boiling; While, when the filling ratio is relatively small, boiling occurs almost synchronously at the top and the bottom. After reaching the steady state, the temperature at the top is higher due to the dry-out phenomenon at the top; The peak temperature and steady state temperature of the evaporator which is farther from the condenser is higher due to the larger flow resistance; For a certain evaporator, when the other evaporator in parallel is also heated, the amplitude of temperature fluctuation is larger and the frequency is smaller compared with only one evaporator is heated.